Fusible service-protector.



C. H. SHOEBRIDGE.

FUSIBLE SERVICE PROTECTOR.

APPLICATION FILED DEC.I8.1916.

Patented Feb. 12, 1918.

gvwe vfoz Jkaei v$331 mto'ahcq CHRISTOPHER H. SHOEBRIDGE, OF NEW YORK, N. Y.

FUSIBLE SERVICE-PROTECTOR.

Specification of Letters Patent.

Patented Feb. 12, 1918.

Application filed December 18, 1916. Serial No. 137,512.

To all whom it may concern:

Be it known that I, CHRISTOPHER H. SHOE- ninnon, a citizen of the United States, and resident of New York city, borough of Manhattan, in the county of New York and State f New York, have invented certain new and useful Improvements in Fusible Service- Protectors, of which thefollowing is a specification.

In certain electric circuits, such as on flexible extensions from service lines, when a short circuit occurs in such extension line, the service line is liable to be blown or a fuse in such line will be blown, lacing all the lights or other apparatus on tie line out of use until repairs are made. The object of my invention is to provide means in the extension line to include a fuse therein, between the lamp or other instrument on such line and the socket or outlet to which the latter is connected, whereby if such exten sion line becomes short circuited, such fuse will be blown and thereby will protect the service line, whereby itwill be necessary to substitute another extension line for the short-circuited one and the use of the system can proceed, thereby avoiding blowing out or injuring such circuit or any apparatus thereon.

1n the form of my invention illustrated intl 5 accompanying drawings I provide an insulating member having a threaded sleeve in an ordinary manner to screw into a socket or outlet oirtlie service line, said member having an extension wire or conductor insulated therein and connected with said sleeve, the member also having a terminal within the sleeve with a wire insulated in the insulating member connected with said terminal,'said wire leading to a sleeve buried in said member, said sleeve being adapted to receive an ordinary fuse plug to make circuit between its sleeve and the sleeve of said member through the fuse in the plug to the central terminal of the latter and buried in the insulating member is a termi nal connected to a wire or, conductor of such extension line having its end portion buried in said member, said terminal being adapted to be engaged by the central terminal of the plug when the latter is screwed into the last named sleeve of said member, whereby the fuse plug is includedin series in the extension line. The arrangement is such that if a short circuit occurs on said extension line the fuse of said plug will be blown,

thereby protecting the service line, and whereby such member and its extension line may be removed and another replaced and said removed extension line may be repaired for further use.

Reference is to be had to the accompanying drawings forming part hereof, wherein,

Figure l is a side view illustrating my improvements in position on an outlet;

Fig. 2 is a plan view of my improved fusible service -protector on an enlarged scale, and

Fig. 3 is a section on the line 3, 3, in.

central terminal in the branch 2, complemental to sleeve 3. and connected with a conductor 9, as by solder, as at 10, in a wellknown manner, said conductor being buried in the insulating material of member 1, the opposite end of such conductor being connected to a metal sleeve 11 that is located in a recess 12 in branch 4: of member 1. At 13 is indicated generally a fuse plug,having the insulating block let carrying the metal sleeve 15 to screw into sleeve 11, and having the fusible metal 16 secured to sleeve 11, as by solder, in an ordinary manner, and connected with the central terminal 17 of the plug. The terminal 17 is adapted, when the plug is screwed into sleeve 11, to engage a terminal 18 part of which is buried in the insulating material of member 1 in axial alinement with recess 12, thereby being complemental to the internal sleeve 11, the terminal 18 being connected with conductor 19 of the extension line, as at 20, by means of solder or in any suitable'manner. The inner portion of conductor 19 is buried in'the insulating member 1. It will be observed that the fuse plug is in series in the extension line.

Any suitable electrical instrument, such as a lamp 21,may be connected with the extension line in any well known manner.

In using my improvements it is merely necessary to screw the sleeve 3 into the socket or outlet 22 of an electrical service line in an ordinary manner of connecting an extension line to the service line, and thereupon the fuse plug 18 will be in series in said line, so that if such extension line should become short-circuited the fusible metal 16 of the fuse plug will be blown, thereby protecting the service line from being blown or other damage. It will then merely be necessary to remove the member 1 of such short circuited extension line from the socket 22, and attach another extension line equipped with my improvements to such socket, whereby the use of an extension on said service line may be continued. After a short circuited extension line equipped with my improvements has been removed from socket 22 it may be repaired and resupplied with a fuse plug ready for use again. My improvements will be found of advantage in many relations, particularly in underground tunnel work, foundations, excavations and the like where extension lines are most liable to be injured owing to the character of work being carried out, since merely an extension line will be temporarily put out of commission instead of the whole service line to which such extension has been connected, which extension line will have prevented blowing of the service line.

My improvements may be used in extension lines embodying any desired electric appliances, such, for instance, as lamps, sadirons, toasters, dental engines, vibrators, motors, fans, and the like.

Having now described my invention what I claim is 1. A service protector comprising a member having an external and an internal threaded sleeve, :1 terminal adjacent to the external sleeve and electrically connected with the other sleeve, a terminal for a plug complemental to the last named sleeve, extension lines operativelv connected with the last named terminal and with the first named sleeve, and a fuse plug adapted for connection with said internal sleeve and its complemental terminal.

2. A service protector comprising an insulating member having a branch provided With a threaded sleeve and having a recess provided with a threaded sleeve. a terminal secured in said branch with relation to the external sleeve, a terminal connnunicating with said recess and secured in said member in complemental relation to the internal sleeve, extension conductors having portions buried in said insulating member, one of which conductors is connected to the-exten nal sleeve and the other" connected to said complemental terminal, and a fuse plug adapted to screw into the internal sleeve and to coact with its complemental terminal for inclusion in series in said extensioivconductors.

3. A service protector comprising an insulating member having a branch provided with an external sleeve, a terminal partially buried in said branch, said member having a recess, a threaded sleeve within said recess, a conductor buried in said insulating member and connected with said terminal and with said internal sleeve respectively, a terminal having a portion buried in said member and complemental to said internal sleeve. extension conductors having portions buried in said insulation one of said conductors connected to said external sleeve and the other conductor connected to said complemental terminal, and a fuse plug adapted to screw into said internal sleeve and to connect with said complemental terminal to include said plug in series with said extension conductors.

t. A service protector comprising an insulating member, extension conductors having portions extending into said member, said member having a sleeve connected with one of said conductors and a terminal for a l"use plug connected with the other of said eonductors, said member having a sleeve e0l11- plemental to the last named terminal, a plug adapted to screw into said sleeve and to coact with said terminal, said member having a terminal complemental to the first named sleeve and electrically connected with the second named sleeve whereby the plug is included in series in said extension conductors.

5. Aservice protector comprising a mem ber having associate terminals to cooperate with complemental terminals of an outlet of a service line, extension conductors eonnected with said member and one of said conductors connected to one of said lirst named terminals, :1 terminal in said member connected to the other of said extension conductors, said member having a recess communicating with said last named terminal, a sleeve in said recess connected to the other of said first named terminals. and a. plug adapted to screw into said sleeve to connect its fuse in series with the internal sleeve and said terminal in said member.

Signed atNew York city, in the county 

